Description: The wide range of applications allows it to be used in different scenarios. Solar power supply makes the transmitter very energy-saving and durable. 52 songs allow you to set it according to your preferences. The working distance of 300 meters makes it very reliable and practical. Made of ABS material, it is very durable to use. The length of the receiver is 8.5cm, the width is 8.5cm and the height is 2.6cm. And the length of the transmitter is 8cm, the width is 5.9cm and the height is 4.5cm. It is not only suitable for home, but also for passageways, restaurants, stores, hotels and other larger commercial spaces. One transmitter can be matched with several receivers. One receiver can be matched with several transmitters as well. 4-gear adjustable volume including silent mode. Item Name: Home Wireless Doorbell Material: ABS Color: White, Black Working Distance: 300 Meters Product Specifications: Two to One Music Adjustment: 52 Pieces of Music Range In Open Spaces: Max. 200-300m Receiver Power: 2W Receiver Power: Plug In Receiver Working Current: 60mA Receiver Quiescent Current: 7mA Receiver Working Voltage: 90V-260V Receiver Plug Type: US Plug, EU Plug Transmitter Working Voltage: 3.7V Transmitter Power Supply Mode: Solar Transmitter Waterproof Function: IP65 Transmitter Power Supply: 150mA Battery (Included) Volume Adjustment: 25-80dB (4 Gears Cyclic Adjustment) Features: Power Saved, Convenient, High Sensitivity Size Details: Receiver: 8.5cm x 8.5cm x 2.6cm/3.35" x 3.35" x 1.02" (Approx.) Transmitter: 8cm x 5.9cm x 4.5cm/3.15" x 2.32" x 1.77" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Precautions: 1. Firstly plug into the socket, press volume button for 6 seconds, blue led light keep on, then press transmitter button, when receiver blue led flash, means pair successfully. 2. It will fail paring if you can not finished within 6 seconds 3. Attention: One transmitter can be matched with several receivers. One receiver can be matched with several transmitters as well, and with memory function once off power. Package Includes: 1 x Receiver 2 x Transmitters 1 x User Manual